Some fact on Blood/Blood cells (Human) #Health

Blood is three times thicker than water and the average person has between nine and 4.5-6 litres (12 pints) of it in their body.
There are about 50-75 trillion cells in the body and half of these are red blood cells. Red blood cells make 250,000 trips around the body during their four-month lifespan. It takes about 30 seconds for a red blood cell to circle the entire body. Every second about eight million blood cells die and another eight million are formed. It takes the entire blood supply in your body
just 60 seconds to make a complete circuit of the heart, lungs and blood vessels and back to the heart. Nearly half the population is blood type O, and can donate blood to people with all other blood groups but can only receive Type O themselves. The rarest type of blood is AB and is present in about 4 per cent of the population ? these people can receive all types of blood. We can lose one third of our blood without harm, but if we lose half we’ll die.